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I have a 1973 Datsun 240z that I don't drive in bad weather. If the car sits for longer than 3 days...

I have a 1973 Datsun 240z that I don't drive in bad weather. If the car sits for longer than 3 days, it takes a lot of cranking to get the fuel to the carbs. The other day, while cranking the engine after a three day layoff, all electrical in the car just died. After about 15 minutes of waiting, the electrical was back on and the car started after a short period of cranking. I presume I overheated some type of circuit, I just don't know which one. Any ideas?Thanks